This article poses and solves the problem of building a model toolkit for assessing the level of sustainable development of electric power enterprises. The indicators characterizing the state of the enterprise in terms of economic, environmental and social characteristics are proposed. In the economic aspect, it is proposed to focus on such a threat to sustainable economic development as economic insolvency. In the process of modeling economic insolvency, Altman's five-factor model scenarios are used. To resolve the contradictions between economic development, the rational use of resources and the negative impact on the environment, the article proposes a logical-linguistic model that allows to resolve this conflict. Keywords: sustainable development; electric power enterprises; mathematical modeling; logical-linguistic approach.